2 Peter 2:22 in the King James Version
But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.
Context
21 For it would be better for them not to have known the way of righteousness, than after knowing it, to turn back from the holy commandment delivered to them.
22 But it has happened to them according to the true proverb, “The dog turns to his own vomit again,” and “the sow that has washed to wallowing in the mire.”